97 lines
3.5 KiB
Ruby
97 lines
3.5 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Migrations
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class Runner
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BASE_RESULT_DIR = Rails.root.join('tmp', 'migration-testing').freeze
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METADATA_FILENAME = 'metadata.json'
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SCHEMA_VERSION = 2 # Version of the output format produced by the runner
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class << self
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def up
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Runner.new(direction: :up, migrations: migrations_for_up, result_dir: BASE_RESULT_DIR.join('up'))
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end
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def down
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Runner.new(direction: :down, migrations: migrations_for_down, result_dir: BASE_RESULT_DIR.join('down'))
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end
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def migration_context
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@migration_context ||= ApplicationRecord.connection.migration_context
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end
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private
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def migrations_for_up
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existing_versions = migration_context.get_all_versions.to_set
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migration_context.migrations.reject do |migration|
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existing_versions.include?(migration.version)
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end
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end
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def migration_file_names_this_branch
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`git diff --name-only origin/HEAD...HEAD db/post_migrate db/migrate`.split("\n")
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end
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def migrations_for_down
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versions_this_branch = migration_file_names_this_branch.map do |m_name|
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m_name.match(%r{^db/(post_)?migrate/(\d+)}) { |m| m.captures[1]&.to_i }
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end.to_set
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existing_versions = migration_context.get_all_versions.to_set
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migration_context.migrations.select do |migration|
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existing_versions.include?(migration.version) && versions_this_branch.include?(migration.version)
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end
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end
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end
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attr_reader :direction, :result_dir, :migrations
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delegate :migration_context, to: :class
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def initialize(direction:, migrations:, result_dir:)
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raise "Direction must be up or down" unless %i[up down].include?(direction)
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@direction = direction
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@migrations = migrations
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@result_dir = result_dir
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end
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def run
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FileUtils.mkdir_p(result_dir)
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verbose_was = ActiveRecord::Migration.verbose
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ActiveRecord::Migration.verbose = true
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sorted_migrations = migrations.sort_by(&:version)
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sorted_migrations.reverse! if direction == :down
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instrumentation = Instrumentation.new(result_dir: result_dir)
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sorted_migrations.each do |migration|
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instrumentation.observe(version: migration.version, name: migration.name, connection: ActiveRecord::Migration.connection) do
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ActiveRecord::Migrator.new(direction, migration_context.migrations, migration_context.schema_migration, migration.version).run
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end
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end
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ensure
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if instrumentation
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stats_filename = File.join(result_dir, Gitlab::Database::Migrations::Instrumentation::STATS_FILENAME)
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File.write(stats_filename, instrumentation.observations.to_json)
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metadata_filename = File.join(result_dir, METADATA_FILENAME)
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File.write(metadata_filename, { version: SCHEMA_VERSION }.to_json)
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end
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# We clear the cache here to mirror the cache clearing that happens at the end of `db:migrate` tasks
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# This clearing makes subsequent rake tasks in the same execution pick up database schema changes caused by
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# the migrations that were just executed
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ApplicationRecord.clear_cache!
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ActiveRecord::Migration.verbose = verbose_was
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end
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end
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end
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end
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end
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